/*
 * FreeRTOS Kernel V10.3.1
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://www.FreeRTOS.org
 * http://aws.amazon.com/freertos
 *
 * 1 tab == 4 spaces!
 */

#ifndef PORTMACRO_H
    #define PORTMACRO_H

    #ifdef __cplusplus
        extern "C" {
    #endif

    #include <machine/cpu.h>

/*-----------------------------------------------------------
 * Port specific definitions.
 *
 * The settings in this file configure FreeRTOS correctly for the
 * given hardware and compiler.
 *
 * These settings should not be altered.
 *-----------------------------------------------------------
 */

/* Type definitions. */
    #define portCHAR          char
    #define portFLOAT         float
    #define portDOUBLE        double
    #define portLONG          long
    #define portSHORT         short
    #define portSTACK_TYPE    uint32_t
    #define portBASE_TYPE     long

    typedef portSTACK_TYPE   StackType_t;
    typedef long             BaseType_t;
    typedef unsigned long    UBaseType_t;

    #if ( configUSE_16_BIT_TICKS == 1 )
        typedef uint16_t     TickType_t;
        #define portMAX_DELAY    ( TickType_t ) 0xffff
    #else
        typedef uint32_t     TickType_t;
        #define portMAX_DELAY    ( TickType_t ) 0xffffffffUL
    #endif
/*-----------------------------------------------------------*/

/* Architecture specifics. */
    #define portSTACK_GROWTH               ( -1 )
    #define portTICK_PERIOD_MS             ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
    #define portBYTE_ALIGNMENT             4
    #define portNOP()    __asm__ volatile ( "mov r0, r0" )
    #define portCRITICAL_NESTING_IN_TCB    1
    #define portIRQ_TRAP_YIELD             31
/*-----------------------------------------------------------*/

/* Task utilities. */

    extern void vPortYield( void );

/*---------------------------------------------------------------------------*/

    #define portYIELD()    asm __volatile__ ( " trap #%0 " : : "i" ( portIRQ_TRAP_YIELD ) : "memory" )
/*---------------------------------------------------------------------------*/

    extern void vTaskEnterCritical( void );
    extern void vTaskExitCritical( void );
    #define portENTER_CRITICAL()    vTaskEnterCritical()
    #define portEXIT_CRITICAL()     vTaskExitCritical()
/*---------------------------------------------------------------------------*/

/* Critical section management. */
    #define portDISABLE_INTERRUPTS()    cpu_int_disable()
    #define portENABLE_INTERRUPTS()     cpu_int_enable()

/*---------------------------------------------------------------------------*/

    #define portYIELD_FROM_ISR( xHigherPriorityTaskWoken )    if( xHigherPriorityTaskWoken != pdFALSE ) vTaskSwitchContext()

/*---------------------------------------------------------------------------*/

    #define portSAVE_CONTEXT()                                                                            \
    asm __volatile__                                                                                      \
    (                                                                                                     \
        "sub	r1, #68					\n"/* Make space on the stack for the context. */                 \
        "std	r2, [r1] + 	0			\n"                                                               \
        "stq	r4, [r1] +	8			\n"                                                               \
        "stq	r8, [r1] +	24			\n"                                                               \
        "stq	r12, [r1] +	40			\n"                                                               \
        "mov	r6, rtt					\n"                                                               \
        "mov	r7, psr					\n"                                                               \
        "std	r6, [r1] +	56			\n"                                                               \
        "movhi	r2, #16384				\n"   /* Set the pointer to the IC. */                            \
        "ldub	r3, [r2] + 2			\n"   /* Load the current interrupt mask. */                      \
        "st		r3, [r1]+ 64			\n"   /* Store the interrupt mask on the stack. */                \
        "ld		r2, [r0]+short(pxCurrentTCB)	\n"/* Load the pointer to the TCB. */                     \
        "st		r1, [r2]				\n"   /* Save the stack pointer into the TCB. */                  \
        "mov	r14, r1					\n"   /* Compiler expects r14 to be set to the function stack. */ \
    );
/*---------------------------------------------------------------------------*/

    #define portRESTORE_CONTEXT()                                                                       \
    asm __volatile__ (                                                                                  \
        "ld		r2, [r0]+short(pxCurrentTCB)	\n"/* Load the TCB to find the stack pointer and context. */\
        "ld		r1, [r2]				\n"                                                             \
        "movhi	r2, #16384				\n"   /* Set the pointer to the IC. */                          \
        "ld		r3, [r1] + 64			\n"   /* Load the previous interrupt mask. */                   \
        "stb	r3, [r2] + 2  			\n"   /* Set the current interrupt mask to be the previous. */  \
        "ldd	r6, [r1] + 56			\n"   /* Restore context. */                                    \
        "mov	rtt, r6					\n"                                                             \
        "mov	psr, r7					\n"                                                             \
        "ldd	r2, [r1] + 0			\n"                                                             \
        "ldq	r4, [r1] +	8			\n"                                                             \
        "ldq	r8, [r1] +	24			\n"                                                             \
        "ldq	r12, [r1] +	40			\n"                                                             \
        "add	r1, #68					\n"                                                             \
        "rti							\n"                                                             \
        );

/*---------------------------------------------------------------------------*/

/* Task function macros as described on the FreeRTOS.org WEB site. */
    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
/*---------------------------------------------------------------------------*/

    #ifdef __cplusplus
        }
    #endif

#endif /* PORTMACRO_H */
